CN107132455A - A kind of grounding net of transformer substation performance estimating method injected based on ground line current - Google Patents

A kind of grounding net of transformer substation performance estimating method injected based on ground line current Download PDF

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Publication number
CN107132455A
CN107132455A CN201710383738.4A CN201710383738A CN107132455A CN 107132455 A CN107132455 A CN 107132455A CN 201710383738 A CN201710383738 A CN 201710383738A CN 107132455 A CN107132455 A CN 107132455A
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China
Prior art keywords
transformer
diverting coefficient
current
grounding net
substation
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CN201710383738.4A
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CN107132455B (en
Inventor
马御棠
马仪
简利胜
张波
连宝晶
周仿荣
王科
丁薇
黄然
黑颖顿
杨江
江能清
陈志喜
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Electric Power Research Institute of Yunnan Power Grid Co Ltd
Nujiang Power Supply Bureau of Yunnan Power Grid Co Ltd
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Tsinghua University
Electric Power Research Institute of Yunnan Power Grid Co Ltd
Nujiang Power Supply Bureau of Yunnan Power Grid Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/088Aspects of digital computing

Abstract

This application discloses a kind of grounding net of transformer substation performance estimating method injected based on ground line current, methods described includes:Obtain Substation parameters and the original diverting coefficient k of grounding net of transformer substatione2;Select an aerial earth wire of transformer station, and the Injection Current I on aerial earth wirew, the total current I that the circuit of measurement access transformer station flows out respectivelyw1The electric current I flowed out with transformer neutral pointN, according to electric current Iw、Iw1And INCalculating obtains grounding net of transformer substation earth current Ig, according to electric current IgAnd IwCalculating obtains grounding net of transformer substation diverting coefficient ke1, calculate the diverting coefficient ke1With original diverting coefficient ke2Variable quantity, assess the security performance of the grounding net of transformer substation.The appraisal procedure that the application is provided need not carry out the measurement of substation grounding resistance, substantially reduce measurement workload, and this method can be carried out when transformer station normally runs, without having a power failure.

Description

A kind of grounding net of transformer substation performance estimating method injected based on ground line current
Technical field
Connect the present invention relates to grounding net of transformer substation technical field, more particularly to a kind of transformer station injected based on ground line current Earth mat performance estimating method.
Background technology
Grounded screen is played a very important role in safe operation of power system, and it is not only that various electrical equipments are provided One public signal reference ground, it is often more important that fault current can be drained rapidly in system jam and ground electricity is reduced The rise of position, therefore the quality of Grounding performance is directly connected to the personal safety of work of electric power system personnel and various electricity The safety of gas equipment and normal operation.In recent years, due to China's need for electricity rapid growth, power system scale and capacity are rapid Expand, earth short circuit current is increasing, so that the safe and reliable performance to grounded screen proposes higher requirement.IEEE is advised Fixed, substation grounding resistance need to meet R≤2000/Ig, and wherein Ig is the asymmetric electricity of maximum earth fault that grounded net enters ground Stream.
At present, the method for assessing grounding net of transformer substation performance is mainly the grounding resistance of measurement transformer station, generally uses The method of Grounding Resistance Measurement is three electrode method, and three electrode method (also known as Current Voltage pole method) refers to grounded screen G, voltage auxiliary The method of three electrode test grounding resistances of pole P1 and electric current interpole P2 compositions, it is general that electrode is arranged using straight-line method, such as Shown in Fig. 1.During measurement, external power supply, test electric current is injected by grounded screen G (being equivalent to dome electrode), in grounded screen G, electricity Flow interpole P2 and between the earth formation loop, the current value in loop is obtained with ammeter measurement, and measured and connect with voltmeter Magnitude of voltage between earth mat G and voltage interpole P1, than upper current value is that can obtain grounding resistance with magnitude of voltage.
But, using during three electrode method Grounding Resistance Measurement, it is necessary to lay up to hundreds of meters of even several kilometers of electricity Pressure, current feed, and supporting measurement soil texture and soil resistivity are needed, workload is very big.Also three electrode method measuring method Influence factor is more, causes measurement error larger.
The content of the invention
The invention provides a kind of grounding net of transformer substation performance estimating method injected based on ground line current, to solve at present Measuring method workload is big, the problem of measurement error is larger.
The invention provides a kind of grounding net of transformer substation performance estimating method injected based on ground line current, methods described bag Include:
Obtain Substation parameters and the original diverting coefficient k of grounding net of transformer substatione2
Select an aerial earth wire of the transformer station, and the Injection Current I on the aerial earth wirew, measure connect respectively Enter the total current I of the circuit outflow of the transformer stationw1The electric current I flowed out with transformer neutral pointN
According to formula Ig=Iw-Iw1-INCalculating obtains the grounding net of transformer substation earth current Ig
According to formula ke1=Ig/IwCalculating obtains the grounding net of transformer substation diverting coefficient ke1
Compare the diverting coefficient ke1With original diverting coefficient ke2, assess the security performance of the grounding net of transformer substation.
Optionally, the acquisition Substation parameters, are specifically included:
The transformer station includes n roots aerial earth wire and m telegram in reply cables, wherein, n >=1, m >=0.
Optionally, the total current I of the circuit of the measurement access transformer stationw1, specifically include:
The electric current I of the n-1 roots aerial earth wire outflow of the measurement access transformer stationw2
The electric current I of the m telegrams in reply cable outflow of the measurement access transformer stationw3
Optionally, the comparison diverting coefficient ke1With original diverting coefficient ke2, assess the grounding net of transformer substation Security performance, is specifically included:
Calculate the diverting coefficient ke1With original diverting coefficient ke2Size variation amount;
If the diverting coefficient ke1With original diverting coefficient ke2Variable quantity be more than 20%, then judge that the transformer station connects Earth mat there may be failure;
If the diverting coefficient ke1With original diverting coefficient ke2Variable quantity be less than or equal to 20%, then judge the change Power station grounded screen is functional.
The technical scheme that the present invention is provided can include the following benefits:
The grounding net of transformer substation performance estimating method injected based on ground line current that the present invention is provided, methods described is included: Substation parameters are obtained, calculating obtains the original diverting coefficient k of grounding net of transformer substatione2, an aerial earth wire of transformer station is selected, and The Injection Current I on the aerial earth wirew, the total current I that the circuit of measurement access transformer station flows out respectivelyw1It is neutral with transformer The electric current I of point outflowN, according to formula Ig=Iw-Iw1-INCalculating obtains grounding net of transformer substation earth current Ig, according to formula ke1= Ig/IwCalculating obtains grounding net of transformer substation diverting coefficient ke1, compare diverting coefficient ke1With original diverting coefficient ke2, assess transformer station The security performance of grounded screen.The grounded screen performance estimating method proposed by the present invention measured based on CURRENT DISTRIBUTION, without being become The measurement of power station grounding resistance, substantially reduces measurement workload;And this method can be carried out when transformer station normally runs, Without having a power failure;The result of also this method measurement is influenceed smaller by season, weather.
It should be appreciated that the general description of the above and detailed description hereinafter are only exemplary and explanatory, not Can the limitation present invention.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, letter will be made to the required accompanying drawing used in embodiment below Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor, Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the method schematic diagram that prior art measures grounding resistance of transformer substation grounding net;
Fig. 2 is a kind of grounding net of transformer substation performance estimating method injected based on ground line current provided in an embodiment of the present invention Schematic flow sheet;
Fig. 3 is a kind of grounding net of transformer substation performance estimating method injected based on ground line current provided in an embodiment of the present invention Instrumentation plan;
Fig. 4 is a kind of grounding net of transformer substation performance estimating method injected based on ground line current provided in an embodiment of the present invention Middle S200 detailed process schematic diagram;
Fig. 5 is a kind of grounding net of transformer substation performance estimating method injected based on ground line current provided in an embodiment of the present invention Middle S500 detailed process schematic diagram.
Embodiment
Referring to Fig. 2, the grounding net of transformer substation Performance Evaluation side injected based on ground line current provided for the embodiment of the present application The flow chart of method.
S100:Obtain Substation parameters and the original diverting coefficient k of grounding net of transformer substatione2
Specifically, the aerial earth wire of transformer station and the quantity of cable are obtained, transformer station includes n roots aerial earth wire and m wires back Cable, wherein, n >=1, m >=0.Transformer station generally comprises and the aerial earth wire of more than 2 is connected on a plurality of loop line, every loop line, assessment Before grounding net of transformer substation performance, the aerial earth wire of access transformer station and the quantity and its grounding net of transformer substation of cable are obtained first Original diverting coefficient ke2
S200:Select an aerial earth wire of the transformer station, and the Injection Current I on the aerial earth wirew, survey respectively The total current I of the circuit outflow of amount access transformer stationw1The electric current I flowed out with transformer neutral pointN
Specifically, an aerial earth wire on a loop line of transformer station to be assessed is selected, is injected on the aerial earth wire Electric current Iw, as shown in figure 3, the external impressed current source on a certain aerial earth wire in transformer station, uses current probe C1Measure Injection Current Aerial earth wire on by the aerial earth wire enter transformer station electric current Iw.Enter the electric current I of transformer station by aerial earth wirewBy Aerial earth wire, cable, transformer neutral point and grounded screen are shunted, and measure the line of access transformer station respectively using current probe The electric current I of road (aerial earth wire and cable) outfloww1, use current probe C3The electric current I of measuring transformer neutral point outflowN, And grounded screen earth current can not direct measurement, can calculate and obtain.
The electric current I of the circuit (aerial earth wire and cable) of measurement access transformer stationw1Specific method referring to Fig. 4.
S201:The electric current I of the n-1 roots aerial earth wire outflow of the measurement access transformer stationw2
S202:The electric current I of the m telegrams in reply cable outflow of the measurement access transformer stationw3
Specifically, the aerial earth wire of more than two is generally connected on a loop line, and belongs to pass in parallel between aerial earth wire System, positioned at the both sides of shaft tower.And transformer station includes n roots aerial earth wire (n >=1), current probe C is used2Measure the built on stilts ground of n-1 roots The electric current I flowed out on linew2.Further, transformer station is typically provided with m telegrams in reply cable (m >=0), and cable can also play shunting action, if treating Assess transformer station and do not include cable, be then not required to measure the electric current;If m telegram in reply cables are contained in transformer station, because the shunting of cable is made With using current probe C4The total current I of the m telegrams in reply cable outflow of measurement access transformer stationw3
When transformer station is not provided with cable, electric current Iw3Size be zero, now access transformer station circuit (aerial earth wire) The total current I of outfloww1=Iw2;When transformer station is provided with cable, circuit (the aerial earth wire and cable) outflow of access transformer station Total current Iw1=Iw2+Iw3.Therefore, the electric current of the circuit outflow of access transformer station should depend on the circumstances.
S300:According to formula Ig=Iw-Iw1-INCalculating obtains the grounding net of transformer substation earth current Ig
Specifically, the electric current I of transformer station is entered by aerial earth wirewBy aerial earth wire, cable, transformer neutral point and connect Earth mat is shunted, and the electric current of aerial earth wire, cable and transformer neutral point outflow can obtain electric current by current probe measurement Size, the electric current that the circuit (aerial earth wire and cable) that can measure access transformer station by current probe respectively flows out is Iw1=Iw2+ Iw3, the electric current of transformer neutral point outflow is IN, and grounded screen earth current immeasurability is obtained, but can be calculated by formula (1) Obtain:
S400:According to formula ke1=Ig/IwCalculating obtains grounding net of transformer substation diverting coefficient ke1
Specifically, the grounded screen earth current I obtained according to calculatinggGrounding net of transformer substation diverting coefficient k can be obtainede1, meter Calculating formula is:
Formula (1) is substituted into formula (2), can be obtained:
S500:Compare the diverting coefficient ke1With original diverting coefficient ke2, assess the security of the grounding net of transformer substation Energy.
Specifically, the diverting coefficient k of obtained grounding net of transformer substation to be assessed will be calculatede1With original diverting coefficient ke2Enter Row size compares, and the behavior pattern of grounding net of transformer substation is assessed with this.Wherein, original diverting coefficient k is obtainede2Method and step With obtaining diverting coefficient ke1Method and step is identical, it is important to newly-built into before use, the same of selection transformer station is returned in transformer station Line, carries out Injection Current experiment, the original diverting coefficient k so obtained on the same aerial earth wire of loop linee2Transported with transformer station The diverting coefficient k obtained after row a period of timee1Just there is comparativity, so that the performance of grounding net of transformer substation could be assessed.
As shown in figure 5, assessing comprising the following steps that for grounding net of transformer substation performance according to diverting coefficient:
S501:Calculate the diverting coefficient ke1With original diverting coefficient ke2Size variation amount.
S502:If the diverting coefficient ke1With original diverting coefficient ke2Variable quantity be more than 20%, then judge the power transformation Grounded screen of standing there may be failure.
S503:If the diverting coefficient ke1With original diverting coefficient ke2Variable quantity be less than or equal to 20%, then judge institute State grounding net of transformer substation functional.
Specifically, diverting coefficient k is comparede1With original diverting coefficient ke2Size, calculate diverting coefficient ke1With original shunting Coefficient ke2Size variation amount (ke2-ke1)/ke2If, diverting coefficient ke1With original diverting coefficient ke2Variable quantity (ke2-ke1)/ ke2More than 20%, i.e. diverting coefficient substantially diminishes, then shows that the grounding net of transformer substation there may be failure, it is necessary to carry out further Detection;If diverting coefficient ke1With original diverting coefficient ke2Variable quantity (ke2-ke1)/ke2Less than or equal to 20%, i.e. shunting is Number change is little, then shows that the grounding net of transformer substation is functional.
The application illustrates the grounding net of transformer substation performance injected based on ground line current that the application is provided with an instantiation Appraisal procedure.
Funing station before being taken into use, carries out electric current injection testing, the built on stilts ground in an aerial earth wire of rich military A-wire Enter the electric current I of transformer station on linewFor 1.1kA, while the electric current I of rich another aerial earth wire outflow of force A-wirew2For 0.2kA, Access the electric current I of aerial earth wire outflow on the All other routes of transformer stationw3For 0.2kA, the electric current I of transformer neutral point outflowNFor 0.1kA, thus calculates and obtains original diverting coefficient ke2For 54.5%.After substation operation 2 years, the weight on same aerial earth wire New to carry out electric current injection testing, same computational methods, calculating obtains grounding net of transformer substation diverting coefficient ke1For 12.2%, this point Flow coefficient ke1Much smaller than original diverting coefficient ke2((ke2-ke1)/ke2> 20%), therefore can determine that the grounding net of transformer substation may There is failure, it is necessary to further be detected.
The grounding net of transformer substation performance estimating method injected based on ground line current that the application is provided, methods described is included: Obtain Substation parameters and the original diverting coefficient k of grounding net of transformer substatione2;An aerial earth wire of transformer station is selected, and at this Injection Current I on the line of vacant lotw, electric current IwAerial earth wire, cable, transformer neutral point and grounded screen through accessing transformer station are entered Row shunting, transformer station includes n roots aerial earth wire and m telegram in reply cables, wherein, the circuit of n >=1, m >=0, respectively measurement access transformer station The total current I of outfloww1The electric current I flowed out with transformer neutral pointN, and access the total current I of the circuit outflow of transformer stationw1Including Access the electric current I of the n-1 roots trolley wire outflow of transformer stationw2With the electric current I of the m telegrams in reply cable outflow of access transformer stationw3, i.e. Iw1 =Iw2+Iw3;According to formula Ig=Iw-Iw1-INCalculating obtains grounding net of transformer substation earth current Ig;According to formula ke1=Ig/IwMeter Calculation obtains grounding net of transformer substation diverting coefficient ke1;Calculate the diverting coefficient ke1With original diverting coefficient ke2Variable quantity, according to Diverting coefficient ke1With original diverting coefficient ke2Variable quantity assess the security performance of the grounding net of transformer substation.The application is proposed Based on ground line current inject grounding net of transformer substation performance estimating method, the measurement without carrying out substation grounding resistance, greatly Reduce measurement workload greatly.And this method can be carried out when transformer station normally runs, without having a power failure.Also by ground connection When resistance assesses grounded screen performance, overhead line structures grounding resistance and grounding resistance of transformer substation grounding net change with season, weather simultaneously Become, measurement result influenceed larger by season, weather, and the measurement result that the appraisal procedure that the application is provided is obtained by season, The influence of weather is smaller.
Those skilled in the art will readily occur to its of the present invention after the disclosure that specification and practice are invented here is considered Its embodiment.The application be intended to the present invention any modification, purposes or adaptations, these modifications, purposes or Person's adaptations follow the general principle of the present invention and including undocumented common knowledge in the art of the invention Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by following Claim is pointed out.
Invention described above embodiment is not intended to limit the scope of the present invention..

Claims (4)

1. a kind of grounding net of transformer substation performance estimating method injected based on ground line current, it is characterised in that methods described includes:
Substation parameters are obtained, calculating obtains the original diverting coefficient k of grounding net of transformer substatione2
Select an aerial earth wire of the transformer station, and the Injection Current I on the aerial earth wirew, measurement access is described respectively The total current I of the circuit outflow of transformer stationw1The electric current I flowed out with transformer neutral pointN
According to formula Ig=Iw-Iw1-INCalculating obtains the grounding net of transformer substation earth current Ig
According to formula ke1=Ig/IwCalculating obtains the grounding net of transformer substation diverting coefficient ke1
Compare the diverting coefficient ke1With original diverting coefficient ke2, assess the security performance of the grounding net of transformer substation.
2. according to the method described in claim 1, it is characterised in that the acquisition Substation parameters, specifically include:
The transformer station includes n roots aerial earth wire and m telegram in reply cables, wherein, n >=1, m >=0.
3. method according to claim 2, it is characterised in that the total current of the circuit outflow of the measurement access transformer station Iw1, specifically include:
The electric current I of the n-1 roots aerial earth wire outflow of the measurement access transformer stationw2
The electric current I of the m telegrams in reply cable outflow of the measurement access transformer stationw3
4. according to the method described in claim 1, it is characterised in that the comparison diverting coefficient ke1With original diverting coefficient ke2, the security performance of the grounding net of transformer substation is assessed, is specifically included:
Calculate the diverting coefficient ke1With original diverting coefficient ke2Size variation amount;
If the diverting coefficient ke1With original diverting coefficient ke2Variable quantity be more than 20%, then judge that the grounding net of transformer substation can There can be failure;
If the diverting coefficient ke1With original diverting coefficient ke2Variable quantity be less than or equal to 20%, then judge that the transformer station connects Earth mat is functional.
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CN108646077A (en) * 2018-05-02 2018-10-12 中铁第四勘察设计院集团有限公司 The ground connection parameter acquiring method and device of traction substation
CN111398732A (en) * 2020-03-14 2020-07-10 华中科技大学 Power distribution network system based on active control of ground potential fluctuation and fault identification method thereof
CN111398732B (en) * 2020-03-14 2020-12-29 华中科技大学 Power distribution network system based on active control of ground potential fluctuation and fault identification method thereof

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